The sensitivity of ground surface temperature prediction to soil thermal properties Using the Simple Biosphere Model (SiB2) |
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| Authors: | ZHANG Xiaohui GAO Zhiqiu WEI Dongping |
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| Institution: | College of Earth Science, Graduate University of Chinese Academy of Sciences, Beijing 100049,
Key Laboratory of Computational Geodynamics, Chinese Academy of Sciences, Beijing 100049,
State Key Laboratory of Atmospheric Boundary Layer Physics and Atmosph;State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry,
Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100081,
College of Applied Meteorology, Nanjing University of Information Science and Technology;College of Earth Science, Graduate University of Chinese Academy of Sciences, Beijing 100049, Key Laboratory of Computational Geodynamics, Chinese Academy of Sciences, Beijing 100049 |
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| Abstract: | Using the Simple Biosphere Model (SiB2), soil thermal properties (STP) were examined in a Tibetan prairie during the monsoon
period to investigate ground surface temperature prediction. We improved the SiB2 model by incorporating a revised force-restore
method (FRM) to take the vertical heterogeneity of soil thermal diffusivity (k) into account. The results indicate that (1) the revised FRM alleviates daytime overestimation and nighttime underestimation
in modeled ground surface temperature (T
g), and (2) its role in little rainfall events is significant because the vertical gradient of k increases with increasing
surface evaporation. Since the original formula of thermal conductivity (λ) in the SiB2 greatly underestimates soil thermal conductivity, we compared five algorithms of λ involving soil moisture to investigate the cause of overestimation during the day and underestimation at night on the basis
of the revised FRM. The results show that (1) the five algorithms significantly improve T
g prediction, especially in daytime, and (2) taking one of these five algorithms as an example, the simulated T
g values in the daytime are closer to the field measurements than those in the nighttime. The differences between modeled T
g and field measurements are mostly within the margin of error of ±2 K during 3 August to 4 September 1998. |
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| Keywords: | land surface processes SiB2 sensitivity ground
surface temperature soil thermal diffusivity soil thermal conductivity |
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